Technical Data:
Series: 153
Product type: Micrometer Head, High Accuracy and Resolution
Feature: Fine graduation and high accuracy for inspection equipment
Spindle: Non-rotating
Graduation features: Bidirectional
Measuring face: Carbide tip
Measuring-face hardness: 90 HRA or more
Measuring face: Lapped
Scale finish: White anodized aluminum
Accuracy basis: Wide range / narrow range
Measuring range: 0 - 1 in
Graduation: 10 microinch (Vernier)
Stem diameter: 0.75 in
Stem: Plain
Spindle end: Flat (carbide tip)
Spindle pitch: 0.025 in
Accuracy: +/-0.00005 in wide range / +/-0.00003 in narrow range

Dimensions:
Stem Dia.=18 mm, tolerance 0/-0.02 mm
Spindle Dia.=8 mm
Body/reference Dia.=38.1 mm
Thimble/reference Dia.=85.5 mm
Reference dimensions=31.8 mm; 60.4 mm; 75 mm
Retracted reference dimensions=35.4 mm and 100 mm
Mounting pattern=3-M4x0.7 on PCD28
Inch model mounting equivalent=No.8-32UNC on PCD1.125 in
Angular mounting spacing=120 deg
Metric model mass=765 g
Inch model mass=775 g
Parenthetical dimensions apply with spindle fully retracted